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Polyatomic Ions and Naming

This guide covers the essentials of polyatomic ions, focusing on the naming conventions and how to differentiate between ions that end in -ite and -ate. It explains that -ite indicates one less oxygen atom than -ate, illustrated with examples such as sulfite (SO3²⁻) vs. sulfate (SO4²⁻). Additionally, it emphasizes the importance of using parentheses in chemical formulas when dealing with polyatomic ions, as shown in the formula for calcium nitrate, Ca(NO3)2. This understanding is crucial for correctly writing and interpreting chemical compounds.

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Polyatomic Ions and Naming

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  1. Polyatomic Ions and Naming

  2. Polyatomic ions • Polyatomic ions end in either –ite or –ate • -ite indicates one less oxygen atom than an -ate. Unfortunately it does not tell you how many are actually in the polyatomic. • Sulfite vs Sulfate SO32- vs SO42- • You will look up on the table.

  3. Compounds with Polyatomic Ions • When writing the formula make sure that you put parenthesize around the polyatomic. • Ca (NO3)2 • Ca2+ and NO3-

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